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How to create error message if user hasn't selected any checkboxes


I have a series of sliders with several checkboxes in each one. I am currently working on making each selected checkbox appear in the final “completion” slider which I sort of have an idea on how I’m going to achieve this BUT I’m a little puzzled about how to make an error message if zero checkboxes were selected for all the sliders before the completion page.

Any ideas?

Do you want only one checkbox to be able to be selected? if so, use radio buttons, not checkboxes.